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M2000-00
Tuning & Adjustment
6.7
Copyright TEL
31/12/97
6.4.4
CTCSS Modulation Adjustment
The following instructions apply only to those radios with CTCSS activated and
must be carried out before any further modulation adjustment can proceed.
Refer to the T2000 Programming Manual for the CTCSS channel programming
instructions. The frequency range of the CTCSS tone is 67 to 250.3Hz.
Switch to any channel with CTCSS activated.
Close the PTT switch.
Adjust RV906, on the TCXO PCB, to set the CTCSS tone peak deviation for
±660Hz ±100Hz (±530Hz ±80Hz) [±330Hz ±50Hz] on the modulation meter.
6.4.5
LTR Code Deviation Adjustment
Close the PTT switch and set up a continuous call. This can be an LTR Repeater
Talkaround call, a Repeater Interconnect Call (RIC) or an on-channel call.
Adjust RV906 on the TCXO PCB to set the LTR code deviation to ±1kHz (±900Hz)
[±600Hz].
Note:
The deviation meter must have a good low frequency response to avoid incor-
rect readings.
6.4.6
Modulation Adjustment
Complete the dual point modulation and CTCSS modulation adjustments (Sec-
tion 6.4.3 and Section 6.4.4) before commencing the modulation adjustment.
Apply a 3kHz sine wave at a level of -40dBm to the microphone input.
Select a channel with CTCSS activated and close the PTT switch. If CTCSS is disa-
bled, select any channel.
Adjust RV907 for a +5kHz (+4kHz) [+2.5kHz] deviation reading on the modula-
tion meter.
Maintain the same sine wave output level and sweep the audio frequency from
300Hz to 3.3kHz.
Find the frequency of maximum ‘+’ deviation and readjust RV907 for +5kHz
(+4kHz) [+2.5kHz] deviation.
Reset the modulation meter to read ‘-’ deviation.
Slowly sweep the audio frequency from 300Hz to 3kHz. If the ‘-’ deviation peak is
found to exceed -5kHz (-4kHz) [-2.5kHz], readjust RV907 for a peak deviation of
-5kHz (-4kHz) [-2.5kHz] at that frequency.
The peak deviation should not exceed ±5kHz (±4kHz) [±2.5kHz] on any channel.
Содержание T2000 SERIES II
Страница 3: ...M2000 00 1 Copyright TEL 31 12 97 T2000 Series II Service Manual Issue 301 March 1998 M2000 00 301 ...
Страница 64: ...7 9 2 T2000 TCXO Tx Audio PCB M2000 00 31 10 96 Copyright TEL IPN 220 01389 00 ...
Страница 66: ...7 9 8 T2000 TCXO Tx Audio PCB M2000 00 31 12 97 Copyright TEL IPN 220 01389 02 ...
Страница 94: ...7 14 4 T2020 T2040 T2050 Control Head PCB M2000 00 31 10 96 Copyright TEL IPN 220 01321 04 ...
Страница 98: ...7 16 2 T2000 EMC Filter PCB M2000 00 31 10 96 Copyright TEL IPN 220 01383 01 ...
Страница 100: ...7 17 2 T2000 Data Interface Decoupling PCB M2000 00 31 10 96 Copyright TEL IPN 220 01388 01 ...
Страница 102: ...8 2 Accessories M2000 00 31 12 97 Copyright TEL ...
Страница 110: ...8 10 6 T2000 A450X CTCSS Scrambler Kit M2000 00 31 12 97 Copyright TEL ...
Страница 111: ...M2000 00 T2000 A450X CTCSS Scrambler Kit 8 10 7 Copyright TEL 31 12 97 T2000 A450X PCB IPN 220 01335 04 Top Side ...
Страница 112: ...8 10 8 T2000 A450X CTCSS Scrambler Kit M2000 00 31 12 97 Copyright TEL T2000 A450X PCB IPN 220 01335 04 Bottom Side ...
Страница 113: ...M2000 00 T2000 A450X CTCSS Scrambler Kit 8 10 9 Copyright TEL 31 12 97 ...
Страница 114: ...8 10 10 T2000 A450X CTCSS Scrambler Kit M2000 00 31 12 97 Copyright TEL ...
Страница 124: ...8 13 8 T2000 A66 Single Port UART Kit M2000 00 31 12 97 Copyright TEL ...
Страница 139: ...M2000 00 T2000 A70 Data Modem Kit 8 15 15 Copyright TEL 31 12 97 T2000 A70 Data Modem PCB IPN 220 01378 01 Top Side ...
Страница 140: ...8 15 16 T2000 A70 Data Modem Kit M2000 00 31 12 97 Copyright TEL T2000 70 Data Modem PCB IPN 220 01378 01 Bottom Side ...
Страница 141: ...M2000 00 T2000 A70 Data Modem Kit 8 15 17 Copyright TEL 31 12 97 ...
Страница 142: ...8 15 18 T2000 A70 Data Modem Kit M2000 00 31 12 97 Copyright TEL ...
Страница 150: ...8 16 8 T2000 A03 A04 A16 Remote Loom Kits M2000 00 31 12 97 Copyright TEL ...